He X C
Department of Chemistry, Guangxi Normal University, Guilin, Guangxi, People's Republic of China.
Talanta. 1991 Mar;38(3):319-23. doi: 10.1016/0039-9140(91)80054-4.
The ion flotation of rhodium(III) and palladium(II) with some anionic surfactants has been investigated. Two flotation procedures are proposed for the separation of some platinum metals, based on differences in the kinetic properties of the chloro-complexes of rhodium(III), palladium(II) and platinum(IV). The first involves the selective flotation of Rh(H(2)O)(3+)(6) from PdCl(2-)(4) and PtCl(2-)(6) in dilute hydrochloric acid with sodium dodecylbenzenesulfonate (SDBS). After precipitation of the hydroxide and redissolution in dilute acid, the Rh(III) is converted into Rh(H(2)O)(3+)(6), Pd(II) and Pt(IV) remaining as PdCl(2-)(4) and PtCl(2-)(6) respectively, and separation is achieved by floating the Rh(H(2)O)(3+)(6) with SDBS. The second is for separation of Pd(II). Prior to flotation, the solution of PdCl(2-)(4) and PtCl(2-)(6) is heated with ammonium acetate to convert PdCl(2-)(4) into Pd(NH(3))(2+)(4). The chloro-complex of Pt(IV) is unaffected. The complex cation, Pd(NH(3))(2+)(4), is then selectively floated with SDBS. The procedures are fast, simple and do not require expensive reagents and apparatus.
研究了铑（III）和钯（II）与一些阴离子表面活性剂的离子浮选。基于铑（III）、钯（II）和铂（IV）氯配合物动力学性质的差异，提出了两种浮选方法用于分离某些铂族金属。第一种方法是在稀盐酸中用十二烷基苯磺酸钠（SDBS）从PdCl₄²⁻和PtCl₆²⁻中选择性浮选Rh(H₂O)₆³⁺。在氢氧化物沉淀并重新溶解于稀酸后，Rh(III)转化为Rh(H₂O)₆³⁺，Pd(II)和Pt(IV)分别以PdCl₄²⁻和PtCl₆²⁻形式存在，通过用SDBS浮选Rh(H₂O)₆³⁺实现分离。第二种方法用于分离Pd(II)。在浮选之前，将PdCl₄²⁻和PtCl₆²⁻的溶液与醋酸铵加热，将PdCl₄²⁻转化为Pd(NH₃)₄²⁺。Pt(IV)的氯配合物不受影响。然后用SDBS选择性浮选络合阳离子Pd(NH₃)₄²⁺。这些方法快速、简单，不需要昂贵的试剂和仪器。
